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ST: Fachverband Strahlen- und Medizinphysik
ST 8: Radiation therapy II
ST 8.2: Vortrag
Donnerstag, 24. März 2022, 11:15–11:30, ST-H4
Simulations of silicone-tungsten shieldings for ruthenium eye applicators — •Justine Gemmecke1, Henning Manke1, Michelle Stroth1, Saskia Müller1, Dirk Flühs2, and Bernhard Spaan1 — 1Experimental Physics 5, TU Dortmund — 2Department of Radiotherapy, University hospital Essen
Brachytherapy with Ruthenium-106 eye plaques is a standard treatment modality for ocular tumours.
A silver calotte with an integrated Ruthenium-106 layer is attached to the patient’s eye for a calculated duration, applying the prescribed dose in order to destroy the tumour tissue.
Surrounding healthy tissue and high-risk organs should be spared as much as possible.
To optimize the protection of healthy tissue, precision fit shieldings made of a silicone-tungsten mixture, fixed to the eye plaque surface, are currently being developed.
Their dosimetric properties are investigated by means of both simulations in Geant4 and measurements in a water phantom.
Simulations based on real patient data also allow retrospective estimation of the dose distribution to the tissue, measuring dose-volume histograms of the irradiated area and an evaluation of the effect of the shielding under clinical conditions.
When developing patient individual shieldings, two main aspects have to be considered. First, the highest possible tungsten fraction in the shieldings has to be determined in order to achieve the maximal protection of the healthy tissue.
Second, an easy manufacturing process has to be developed to apply this technique to the clinical routine.